Cyclone
Pronunciation : Cy"clone (s"kln)
Part of Speech : n.
Etymology : [Gr. (Meteor.)
Definition : Defn: A violent storm, often of vast extent, characterized by high winds rotating about a calm center of low atmospheric pressure. This center moves onward, often with a velocity of twenty or thirty miles an hour.
Note: The atmospheric disturbance usually accompanying a cyclone, marked by an onward moving area of high pressure, is called an anticyclone.
Source : Webster's Unabridged Dictionary, 1913